How do I validate a digital signature online for free?

Upload your signed PDF to the Swiss Trust Layer Validator above. The tool instantly checks the cryptographic signature, certificate chain, and timestamp. No account or payment required.

What types of digital signatures can be validated?

Our validator supports eIDAS (EU), ZertES (Switzerland), and standard X.509 certificate-based digital signatures, including qualified electronic signatures (QES), advanced electronic signatures (AES), and all standard PDF signatures.

Is my document safe to upload for validation?

Yes. The validator processes your document entirely in the browser. No file is uploaded to our servers. Your document content is never stored or shared.

What is the difference between validating and sealing a document?

Validation checks whether an existing signature on a document is authentic and unmodified. Sealing (via Swiss Trust Layer) creates a new tamper-proof, court-admissible timestamp for your intellectual property, certified under ZertES and eIDAS.

Can I validate a Swiss ZertES signature?

Yes. The tool natively validates ZertES-compliant qualified electronic signatures, the Swiss standard equivalent to EU eIDAS QES, legally valid before Swiss courts under SR 943.03.

Wie kann ich eine digitale Signatur online kostenlos validieren?

Laden Sie Ihr signiertes PDF in den Swiss Trust Layer Validator hoch. Das Tool prüft sofort die kryptografische Signatur, Zertifikatskette und den Zeitstempel. Kein Konto oder Zahlung erforderlich.

Kann ich eine ZertES-Signatur validieren?

Ja. Der Validator unterstützt ZertES-konforme qualifizierte elektronische Signaturen nach Schweizer Bundesgesetz SR 943.03, rechtsgültig vor Schweizer Gerichten.

Comment valider une signature numérique en ligne gratuitement?

Téléchargez votre PDF signé dans le Validateur Swiss Trust Layer. L'outil vérifie instantanément la signature cryptographique, la chaîne de certificats et l'horodatage, sans compte ni paiement requis.

Puis-je valider une signature ZertES?

Oui. L'outil valide nativement les signatures électroniques qualifiées conformes ZertES, la norme suisse équivalente à l'eIDAS QES de l'UE, juridiquement valable devant les tribunaux suisses.

Free Public Tool

Validate Any Document
Signature Online

Instantly verify the authenticity of any digitally signed PDF. Check eIDAS, ZertES, and X.509 signatures. Free, public, no account needed.

No account required
eIDAS & ZertES compliant
Results in seconds
Free forever

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Standards

Supported Signature Types

The Swiss Trust Layer Validator recognises all major digital signature standards used across Europe and internationally.

eIDAS QES

EU Qualified Electronic Signature: legally equivalent to a handwritten signature in all 27 EU member states.

ZertES QES

Swiss Qualified Electronic Signature (SR 943.03): court-admissible under Swiss federal law.

X.509 Certificates

Industry-standard public key certificates used in TLS, S/MIME, code signing, and document signing.

PDF PAdES

PDF Advanced Electronic Signatures: ETSI EN 319 132 compliant, the international standard for signed PDF documents.

CMS / PKCS#7

Cryptographic Message Syntax: underlying format for most digital signature schemes including S/MIME and PDF.

Swiss Trust Layer Validator vs Other Tools

Tool	Cost	ZertES	No account needed
Swiss Trust Layer	Free
DocuSign	Paid	No	No
Adobe Acrobat	Paid	No	No

How it works

Validate in 3 steps

No software to install. Works in any browser. Results are instant.

01
Upload or drag your signed document
Supports PDF files with embedded digital signatures. No file size limits for standard documents.
02
Automatic signature verification
The validator checks the cryptographic signature chain, issuing CA, certificate expiry, and timestamp integrity in seconds.
03
Get a clear valid / invalid result
See who signed the document, when, with which certificate, and whether any content was modified after signing.

ZertES Compliant

Validates Swiss qualified electronic signatures per SR 943.03

eIDAS Recognised

Accepts EU-standard QES and AES signatures from all member states

Timestamp Verified

Checks RFC 3161 timestamps so you know exactly when the document was signed

Frequently asked questions

Do I need an account to validate a signature?

No. The validator is completely free and public. No registration, no login, no payment.

Which signature standards are supported?

eIDAS (EU), ZertES (Switzerland), UAE Pass, and standard X.509 PDF signatures, including QES and AES levels.

Is my document content stored?

No. Only the signature metadata (certificate, hash, timestamp) is processed. Your document content is never stored.

What if the signature shows as invalid?

An invalid result means either the document was modified after signing, the certificate has expired, or the signature was applied with an untrusted CA. Contact the document sender for a fresh signed copy.

Can I seal my own documents too?

Yes. Swiss Trust Layer lets you seal any intellectual property with a court-proof timestamp in under 2 minutes. Backed by Swisscom Trust Services.

Common questions

How do I verify a Swiss Trust Layer seal?

Upload the sealed PDF to Swiss Trust Layer Validator. The tool checks the cryptographic signature chain, ZertES/eIDAS certificate validity, and timestamp integrity in under 10 seconds. No account required.

Can I check a document for tampering for free?

Yes. The Swiss Trust Layer Document Validator is a permanently free public tool. It detects any modifications made after sealing by verifying the cryptographic hash. No signup, no payment.

What signature formats does the validator support?

The validator supports eIDAS QES and AdES (EU), ZertES (Switzerland), X.509 certificate-based signatures, PAdES PDF signatures, and CMS/PKCS#7 signatures.

Seal, not just validate

Need to protect your own documents?

Swiss Trust Layer gives you a court-proof, tamper-evident timestamp for any intellectual property, in under 2 minutes.

Seal My Idea Book a demo

Validate Any DocumentSignature Online